Arnold Schwarzenegger Guardian Jason Clarke John Connor Emilia Clarke Sarah Connor Jai Courtney Kyle Reese J.K. Simmons O'Brien Lee Byung-hun Cop / T-1000 Dayo Okeniyi Danny Dyson Matt Smith Alex Courtney B. Vance Miles Dyson Michael Gladis Lieutenant Matias Sandrine Holt Detective Cheung Wayne Bastrup Young O'Brien Gregory Alan Williams Detective Harding Otto Sanchez Detective Timmons Matty Ferraro Agent Janssen Griff Furst Agent Burke Nolan Gross Skynet - 12 / 14 yrs old Seth Meriwether Skynet - 18 yrs old Afemo Omilami Perry Teri Wyble Mariam Kerry Cahill Lt. Whitley Kerry O'Malley Kyle's Mom James Moses Black Security Guard #1 Douglas Smith Eric Thompson Anthony Michael Frederick Lead Cop Brandon Stacy Uniform Cop Brett Azar Guardian - Young / Terminator T-800 Douglas M. Griffin Garber Thomas Francis Murphy Derelict Joshua Mikel Angry Driver John Edward Lee Punk Aaron V. Williamson Refugee / Terminator Tony Donno Hospital Security Guard Ernest Wells Garbage Man